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A sewer pipe is normally at neutral air pressure compared to the surrounding atmosphere.When a column of waste water flows through a pipe, it compresses air ahead of it in the system, creating a positive pressure that must be released so it does not push back on the waste stream and downstream traps, slow drainage, and induce potential clogs.
A similar principle can be applied to process piping carrying fluids which may congeal at low temperatures, for example, tars or molten sulfur. Hit-temperature trace heating elements can prevent blockage of pipes. Industrial applications for trace heating range from chemical industry, oil refineries, nuclear power plants, food factories.
Blocked drains are a common problem in bathrooms and kitchens. In some cases, a chemical drain cleaner can clear the blockage, or a drain snake or augur can be used to mechanically clear the blockage. Disassembly of drain pipes can be an effective method of clearing severe blockages, especially if caused by the presence of a solid object.
Cast iron gutters were introduced in the late 18th century as an alternative to lead. Cast iron enabled eaves gutters to be mass-produced: they were rigid and non-porous while lead could only be used as a liner within timber gutters. Installation was a single process and didn't require heat. [26] They could be attached directly to the fascia board.
Downspouts are usually vertical and usually extend down to ground level, although may be routed at an angle to avoid architectural features and may discharge onto an intermediate roof. At the bottom of downspout there are typically features to divert discharged water away from the building's foundations to prevent water damage.
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